* {
  padding: 0;
  margin: 0;
  box-sizing: border-box;
}
ul,
ol {
  list-style: none;
}
img {
  min-height: 100%;
}
.fl {
  float: left;
}
.fr {
  float: right;
}
.clearfix::after {
  content: '';
  display: block;
  clear: both;
}

.container {
  width: 65vw;
  background-color: lightblue;
  margin: 0 auto;
}
.container .leftarea {
  width: 30vw;
}
.container .leftarea .checkimgcontainer {
  width: 30vw;
  height: 30vw;
  background-color: antiquewhite;
}
.container .leftarea .checkimgcontainer .mask{
    width: 100px;
    height: 30vw;
    background-color: antiquewhite;
  }

.container .leftarea .imglist {
  margin-top: 20px;
  width: 100%;
  height: 80px;
}
.container .leftarea .imglist ul {
  width: 60%;
  display: flex;
  align-items: center;
  justify-content: space-around;
  margin: 0 auto;
}
.container .leftarea .imglist ul li {
  width: 80px;
  height: 80px;
  background-color: white;
}

.container .rightarea {
  width: 30vw;
  height: 30vw;

  background-image: url('./images/imgA_3.jpg');
  background-repeat: no-repeat;
  background-position: left top;
  background-size: 1800 800;
  object-fit: fill;
}
